Use ansible_service_mgr fact

This patch removes some extra tasks for detecting systemd and uses
the `ansible_service_mgr` fact instead.

Partial-Bug: #1640125
Change-Id: I240f2b09f123fb929eaca07fec72e981901d7a78

tasks/main.yml

@@ -24,20 +24,6 @@
     tags:
       - always
 
-  - name: Check init system
-    command: cat /proc/1/comm
-    register: _pid1_name
-    changed_when: False
-    check_mode: no
-    tags:
-      - always
-
-  - name: Set the name of pid1
-    set_fact:
-      pid1_name: "{{ _pid1_name.stdout }}"
-    tags:
-      - always
-
   - name: Check for check/audit mode
     command: /bin/true
     register: noop_result
@@ -48,7 +34,6 @@
   - name: Set facts
     set_fact:
       check_mode: "{{ noop_result | skipped }}"
-      systemd_running: "{{ pid1_name == 'systemd' }}"
       linux_security_module: "{{ (ansible_os_family == 'Debian') | ternary('apparmor','selinux') }}"
     tags:
       - always

tasks/rhel6stig/console.yml

@@ -19,7 +19,8 @@
     regexp: '^(#)?exec shutdown -r now "Control-Alt-Delete pressed"'
     line: '#exec shutdown -r now "Control-Alt-Delete pressed"'
     state: present
-  when: not systemd_running | bool
+  when:
+    - ansible_service_mgr != 'systemd'
   tags:
     - console
     - cat1
@@ -32,7 +33,8 @@
   changed_when: False
   check_mode: no
   failed_when: False
-  when: systemd_running | bool
+  when:
+    - ansible_service_mgr == 'systemd'
   tags:
     - always
     - console
@@ -42,7 +44,7 @@
 - name: V-38668 - The x86 Ctrl-Alt-Delete key sequence must be disabled (systemd)
   command: systemctl mask ctrl-alt-del.target
   when:
-    - systemd_running | bool
+    - ansible_service_mgr == 'systemd'
     - "'masked' in cad_mask_check.stdout"
   tags:
     - console

tasks/rhel6stig/misc.yml

@@ -292,7 +292,7 @@
     line: "env DEFAULT_RUNLEVEL=2"
   when:
     - security_disable_x_windows | bool
-    - not systemd_running | bool
+    - ansible_service_mgr != 'systemd'
   tags:
     - cat2
     - V-38674
@@ -303,7 +303,7 @@
   changed_when: "'Created symlink' in systemctl_default_target.stdout"
   when:
     - security_disable_x_windows | bool
-    - systemd_running | bool
+    - ansible_service_mgr == 'systemd'
   tags:
     - cat2
     - V-38674

tasks/rhel6stig/services.yml

@@ -37,7 +37,7 @@
 
 - name: Register which services are installed depending on platform
   set_fact:
-    services_installed: "{{ (systemd_running | bool) | ternary (systemd_services_installed, sysv_services_installed)}}"
+    services_installed: "{{ (ansible_service_mgr == 'systemd') | ternary (systemd_services_installed, sysv_services_installed)}}"
 
 - name: V-38437 - Automated file system mounting tools must be disabled
   service: